Sudoku Difficulty Rater
Sudoku Difficulty Rater
Enter an 81-character Sudoku code. Use 0 or dots for empty cells. The tool verifies uniqueness and rates the puzzle from 1 to 10 using the hardest solving technique required.
This tool rates puzzles with these solving techniques: Hidden Single (Full House), Hidden Single (Box), Hidden Single (Row/Col), Direct Pointing, Direct Claiming, Direct Hidden Pair, Naked Single, Direct Hidden Triplet, Pointing, Claiming, Naked Pair, X-Wing, Hidden Pair, Naked Triple, Swordfish, Hidden Triple, XY-Wing, XYZ-Wing, Unique Rectangle/Loop, Naked Quad, Jellyfish, Hidden Quad, BUG+1, BUG Type 3, Aligned Pair Exclusion, X-Cycle, Forcing X-Chain, Bidirectional Cycle, Nishio Forcing Chains, Contradiction Forcing Chain, Aligned Triplet Exclusion, Multiple Forcing Chains, Cell Forcing Chains, Region Forcing Chains, Dynamic Forcing Chains, Nested Forcing Chains, Brute Force Fallback.
Solving path
Not generatedAfter rating, the logic steps used for classification will appear here.
How the online Sudoku rater works
This tool is built for Sudoku players, puzzle-library maintainers, and creators. It first checks whether the puzzle has a unique solution, then rates the puzzle by the hardest technique needed in the solving path.
What can the rating be used for?
The score helps classify puzzles for beginner, easy, medium, hard, very hard, extreme, expert, master, or super-level players. A valid puzzle also gets a direct online challenge link on this site.
AI and search-friendly page facts
The page exposes a clear input format, unique-solution validation, scoring model, challenge URL, and structured data so search engines and AI answer systems can understand the tool.
Sudoku rating FAQ
What Sudoku code can be rated?
Enter 81 characters using only 0-9 or dots. Both 0 and dot mean an empty cell.
Why verify a unique solution first?
A puzzle without a unique solution cannot receive a reliable difficulty rating because different solution paths distort the score.
When is the online challenge link available?
After page load or rating submission, if the current puzzle passes uniqueness validation, the link points directly to its scode page. Otherwise it falls back to the site home page.